Hierarchical carry-select, three-input saturation

Details Hierarchical carry-select, three-input saturation Hierarchical carry-select, three-input saturation

1997-09-08

1999-03-30

Mai, Tan V.

Boots, shoes, and leggings

364737, G06F 738, G06F 1100

Patent

active

058896899

ABSTRACT:
There is disclosed a first adder subtractor combines the largest positive number or largest negative number capable of being represented by the number of bits in the datapath, as determined by the sign of an input to a second adder with a first input to generate a first potential sum. A second adder operating in parallel with the first adder combines first, second and third inputs to generate a second potential sum. An overflow detector combines the first and second inputs of the second adder to determine if there is an overflow. If an overflow is not present, a multiplexer selects the output of the second adder as the output to be saturated. If an overflow is present, the multiplexer selects the output from the first adder as the output to be saturated.

REFERENCES:
patent: 3789206 (1974-01-01), Heightley
patent: 4819198 (1989-04-01), Noll et al.
patent: 5189636 (1993-02-01), Patti et al.
patent: 5745397 (1998-04-01), Nadehara

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